OOP Lab_1 (work in progress)

#include <iostream>
#include <string>
#include <vector>

using namespace std;

class Unit {
    public:
    int x, y;
};

class Map {
private:
    int height, width;
    string **mat;
    vector<Unit> Units;

public:
    Map (int w, int h) {
       mat = new string*[w];
       for (int i = 0;i < w;i++){
           mat[i] = new string[h];
       }
       for (int i = 0;i < h;i++){
           for (int j = 0;j < w;j++){
               mat[i][j] = " • ";
           }
       }
       height = h;
       width = w;
    }

    void printMap () {
        for (int i = 0;i < height;i++) {
            for (int j = 0;j < width;j++){
               cout << mat[i][j];
            }
            cout << endl;
        }
    }

    void spawnUnits (int amount) {
        for (int i = 0;i < amount;i++){
            Unit unit;
            unit.x = rand() % width;
            unit.y = rand() % height;
            if (mat[unit.x][unit.y] == " • ") {
                Units.push_back(unit);
                mat[unit.x][unit.y] = " ☺ ";
            }
        }
    }

};

int main()
{
    srand (time(NULL));

    Map map(10, 10);
    map.spawnUnits(10);
    map.printMap();
}